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And so, by decree Celestia had created the three-days weekend; Saturday, Caturday, and Snooze Day, so that all Catpone kind can give their thanks and blessings to their Lady and Saviour, whilst curled up on top of all things warm and dry, bathing in sunlight as they take their long, deep naps

But ever time they were show to be on the clouds(which is nothing special in the show) Equestria was already around. And Equestria has been shown many times to be the name of only the kingdom, not the world or the continent, plus whenever they talk about the early days of Equestria they keep saying that Celestia was just a teenager and Luna was only a little older than the CMC when they were made rulers. This has been the one thing about their early days that have straight up said is canon in all forms media, and they haven't even straight up said if those two were born alicorns(like Flurry Heart) or ascension like Twilight and Cadence. Both before and after that book they kept(and still are) going back and forth if those two were born alicorns or were born earth ponies, and yes earth ponies they never once said they were born pegasi or unicorns.

In a way they have, when we first learn of Equestria founded we were told that before the alicorn sisters unicorns use to control the sun and moon. Meaning that if they were alive before the founded they must not have had their cutie marks meaning they couldn't be adults at the time. Meaning the were either born after the founded as non-alicorns or they were young alicorns like in the books and comics when they became princesses. Plus I may add that Celestia her self said that Discord rule Equestria before her, not conquer, not over thrown, but ruled. True we don't know what this truly means and they have done nothing with Discord past really but it does sound like Celestia was saying he was the rightful ruler at one point.

What make you think they are different then the other three alicorns? We don't know if Twilight, Cadence, and Flurry Heart are immoral or not, it is possible that they may keep growing slowly to the size of the sisters and Luna didn't have that mane after she turn back from Nightmare Moon till later. So they may still get that mane type one day.

Hmm, that is not the only conclusion you can have. You could also say, that she felt no need to control the sun. Let the ponies do it themselves. And so on. So, no, your reasons are not the only possibilities.

Well, to "rule over smth." is a relatively general term. It does not mean rightful ruler in any way. Not that it really matters for argumentation's sake, since Celestia and Luna could still have been there, just not active. They observed, they found it too hard to watch, they intervened.

Well, at least we know, that Twilight will not outlive her friends, as being confirmed by the authors of MLP. We don't know about Cadence or Flurry Heart, though I guess at least Cadence could be similar to Twilight.Still there has to be some difference, if Twilight is not as long lived as the princesses of the sun and moon. That's why I said that.